What might be responsible for the blue area. Gas cloud? Clumpyness (if that's a word)??
by Budgieye moderator
Starburst galaxy. The blue area is made by lots of stars forming and exploding, as seen by the amount of hot oxygen. Star formation usually follows merger of galaxies.
For more information see
PAGE 2 Galaxy Redshift Chart https://talk.galaxyzoo.org/#/boards/BGZ0000007/discussions/DGZ0000ulp?page=2
PAGE 3 Spectra guide for SDSS images in Galaxy Zoo Talk https://talk.galaxyzoo.org/#/boards/BGZ0000001/discussions/DGZ0000ulp?page=3&comment_id=53fef2ee3d5a77490c0001b6